/********************************** (C) COPYRIGHT *******************************
 * File Name          : main.c
 * Author             : WCH
 * Version            : V1.0.0
 * Date               : 2019/10/15
 * Description        : Main program body.
 *********************************************************************************
 * Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
 * Attention: This software (modified or not) and binary are used for 
 * microcontroller manufactured by Nanjing Qinheng Microelectronics.
 *******************************************************************************/

/*
 *@Note
 *Hardware flow control mode, master/slave mode, transceiver routine:
 *USART1_Tx(PA9)、USART1_Rx(PA10)、USART1_CTS(PA11)、USART1_RTS(PA12)
 *This example demonstrates UART1 hardware flow control data sending and receiving, 
 *connect the UART1 Tx and Rx pins to the serial port tool respectively,
 *View through the host computer tool, CTS is connected to VCC, and data cannot 
 *be sent, but connected to GND, data can be sent normally
 *
 */

#include "debug.h"


/* Global typedef */
typedef enum { FAILED = 0, PASSED = !FAILED} TestStatus;

/* Global define */
#define TxSize   (size(TxBuffer))
#define size(a)   (sizeof(a) / sizeof(*(a)))

/* Global Variable */
u8 TxBuffer[] = "USART1 Hardware Flow Control Example: USART1-\
Hyperterminal communication using hardware flow control\n\r";
u8 RxBuffer[TxSize] = {0};
u8 TxCnt = 0, RxCnt = 0;


/*********************************************************************
 * @fn      Buffercmp
 *
 * @brief   Compares two buffers
 *
 * @param   Buf1,Buf2 - buffers to be compared
 *          BufferLength - buffer's length
 *
 * @return  PASSED - Buf1 identical to Buf
 *          FAILED - Buf1 differs from Buf2
 */
TestStatus Buffercmp( uint8_t *Buf1, uint8_t *Buf2, uint16_t BufLength )
{
    while( BufLength-- )
    {
        if( *Buf1 != *Buf2 )
        {
            return FAILED;
        }
        Buf1++;
        Buf2++;
    }
    return PASSED;
}

/*********************************************************************
 * @fn      USART1_ReCFG
 *
 * @brief   Reinitialize the USART1.
 *
 * @return  none
 */
void USART1_ReCFG( void )
{
    GPIO_InitTypeDef  GPIO_InitStructure = {0};
    USART_InitTypeDef USART_InitStructure = {0};

    RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA | RCC_APB2Periph_USART1, ENABLE );

    /* USART1 TX-->A.9   RX-->A.10 */
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 ;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_Init( GPIOA, &GPIO_InitStructure );
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;                  /* RTS-->A.12 */
    GPIO_Init( GPIOA, &GPIO_InitStructure );

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10 ;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init( GPIOA, &GPIO_InitStructure );
    GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_11;                 /* CTS-->A.11 */
    GPIO_Init( GPIOA, &GPIO_InitStructure );

    USART_InitStructure.USART_BaudRate = 115200;
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;
    USART_InitStructure.USART_StopBits = USART_StopBits_1;
    USART_InitStructure.USART_Parity = USART_Parity_No;
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_RTS_CTS;
    USART_InitStructure.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;

    USART_Init( USART1, &USART_InitStructure );
    USART_Cmd( USART1, ENABLE );

}

/*********************************************************************
 * @fn      main
 *
 * @brief   Main program.
 *
 * @return  none
 */
int main( void )
{
    NVIC_PriorityGroupConfig( NVIC_PriorityGroup_2 );
    SystemCoreClockUpdate();
    Delay_Init();
    USART1_ReCFG();                                               /* USART1 Reinitialize */
    printf( "SystemClk:%d\r\n", SystemCoreClock );
    printf( "ChipID:%08x\r\n", DBGMCU_GetCHIPID() );
    printf( "USART1 Hardware Flow Control TEST\r\n" );

    while( TxCnt < TxSize )
    {
        USART_SendData( USART1, TxBuffer[TxCnt++] );
        while( USART_GetFlagStatus( USART1, USART_FLAG_TXE ) == RESET );
    }
    do
    {
        if( ( USART_GetFlagStatus( USART1, USART_FLAG_RXNE ) != RESET ) && ( RxCnt < TxSize ) )
        {
            RxBuffer[RxCnt] = USART_ReceiveData( USART1 );
            USART_SendData( USART1, RxBuffer[RxCnt++] );            /* send it when receive a byte */
        }
    }
    while( ( RxBuffer[RxCnt - 1] != '\r' ) && ( RxCnt != TxSize ) );


    while( 1 )
    {
    }
}


